Societies of Civil Engineers, “The Technologies about Effective Utilization for Coal Fly Ash Aiming for the Sound Material-Cycle Society,” Japan, 2003. http://www.jsce.or.jp/committee/enedobo/text/03.pdf
 S. Kashiwakura, H. Kubo, Y. Kumagai, H. Kubo, K. Matsubae-Yokoyama, K. Nakajima and T. Nagasaka, “Removal of Boron from Coal Fly Ash by Washing with HCl Solution”, Fuel, Vol. 88, No. 7, 2009, pp. 1245-1250. doi:10.1016/j.fuel.2008.12.027
 S. Kashiwakura, H. Ohno, K. Matsubae-Yokoyama, Y. Kumagai, H. Kubo and T. Nagasaka, “Removal of Arsenic in Coal Fly Ash by Acid Washing Process Using Dilute H2SO4 Solvent,” Journal of Hazardous Materials, Vol. 181, No. 1-3, 2010, pp. 419-425. doi:10.1016/j.jhazmat.2010.05.027
 S. Kashiwakura, H. Ohno, Y. Kumagai, H. Kubo, K. Matsubae and T. Nagasaka, “Dissolution Behavior of Selenium from Coal Fly Ash Particles for the Development of an Acid-Washing Process,” Chemosphere, Vol. 85, No. 4, 2011, pp. 598-602. doi:10.1016/j.chemosphere.2011.06.099
 Z. X. Yuan, C. Y. Wu, L. M. Xu and Y. X. Ni, “The Distribution of Trace Elements in Granitoids in the Nanling Region of China,” Chinese Journal of Geochemistry, Vol. 12, No. 3, 1993, pp. 193-205. doi:10.1007/BF02843359
 S. Kashiwakura, T. Takahashi, H. Maekawa and T. Nagasaka, “Application of 11B MAS-NMR to the Characterization of Boron in Coal Fly Ash Generated from Nantun Coal,” Fuel, Vol. 89, No. 5, 2010, pp. 1006-1011. doi:10.1016/j.fuel.2009.10.028
 S. Iwata, K. Minamoto, E. Fujimori, K. Chiba and H. Haraguchi, “Determination of Rare Earth Elements in Industrial Waste Incineration Fly Ash by ICP-MS and the Characteristics of the Rare-Earth Element Distribution Pattern (in Japanese),” BUNSEKI KAGAKU, Vol. 50, No. 6, 2001, pp. 419-425. doi:10.2116/bunsekikagaku.50.419
 R. R. Greenberg, E. A. Mackey and D. A. Becker, “The Application of Instrumental Neutron Activation Analysis for the Certification of the New NIST Fly Ash SRM,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 193, No. 1, 1995, pp. 7-14. doi:10.1007/BF02041911
 I. Roelandts and E. S. Gladney, “Consensus Values for NIST Biological and Environmental Standard Reference Materials,” Fresenius Journal of Analytical Chemistry, Vol. 360, No. 3-4, 1998, pp. 327-338. doi:10.1007/s002160050704
 A. Masuda, “Regularities in Variation of Relative Abundances of Lanthanide Elements and an Attempt to Analyse Separation-Index Patterns of Some Minerals,” The Journal of Earth Sciences, Nagoya University, Vol. 10, No. 2, 1962, pp. 173-187.
 C. D. Coryell, J. W. Chase and J. W. Winchester, “A Procedure for Geochemical Interpretation of Terrestrial Rare-Earth Abundances Patterns,” Journal of Geophysical Research, Vol. 68, No. 2, 1963, pp. 559-566. doi:10.1029/JZ068i002p00559
 R. L. Davison, D. F. S. Natusch, J. R. Wallace and C. Evans Jr, “Trace Elements in Fly Ash. Dependence of Concentration on Particle Size,” Environmental Science & Technology., Vol. 8, No. 13, 1974, pp. 1107-1113. doi:10.1021/es60098a003
 K. C. Galbreath, D. L. Toman, C. J. Zygarlicke and J. H. Pavlish, “Trace Element Partitioning and Transformations during Combustion of Bituminous and Subbituminous U. S. Coals in a 7-kW Combustion System,” Energy & Fuel, Vol. 14, No. 6, 2000, pp. 1265-1279. doi:10.1021/ef000105n
 R. Meij and H. Winkel, “The Emissions of Heavy Metals and Persistent Organic Pollutants from Modern Coal-Fired Power Stations,” Atmospheric Environment, Vol. 41, No. 40, 2007, pp. 9262-9272. doi:10.1016/j.atmosenv.2007.04.042
 S. Kashiwakura, T. Takahashi and T. Nagasaka, “Vaporization Behavior of Boron from Standard Coals in the Early Stage of Combustion,” Fuel, Vol. 90, No. 4, 2011, pp. 1408-1415. doi:10.1016/j.fuel.2010.12.029
 N. Tsubouchi, Y. Wang and Y. Ohtsuka, “Fate of the Chlorine in Coal during Temperature-Programmed Pyrolysis,” The proceedings of the Japan Institute of Energy, Vol. 40, 2003, pp. 124-125 (in Japanese).
 N. Tsubouchi, H. Hayashi and Y. Ohtsuka, “Functional Forms of the Fluorine and Carbon in Fly Ashes Formed in Pulverized Coal Combustion,” The proceedings of the Japan Institute of Energy, Vol. 42, 2005, pp. 59-60 (in Japanese).
 S. Yagi and D. Kunii, “Fluidized-Solids Reactors with Continuous Solid Feed—I: Residence Time of Particles in Fluidized Beds,” Chemical Engineering Science, Vol. 16, No. 3-4, 1961, pp. 364-371. doi:10.1016/0009-2509(61)80043-2